diff --git a/_locales/en/messages.json b/_locales/en/messages.json
index 3563a33b..c6317f52 100644
--- a/_locales/en/messages.json
+++ b/_locales/en/messages.json
@@ -723,11 +723,11 @@
   },
   "ScheduledMessagesWarningQuitRequested": {
     "message": "There are messages scheduled to be sent. Send Later can only send messages when $1 is running. Are you sure you want to exit?",
-    "description": ""
+    "description": "$1 is replaced with the localized name for Thunderbird"
   },
   "ScheduledMessagesWarningQuit": {
     "message": "Send Later can only send messages when $1 is running. Please remember to restart it before your messages are scheduled to be sent!",
-    "description": ""
+    "description": "$1 is replaced with the localized name for Thunderbird"
   },
   "IncompatibleEncryptionTitle": {
     "message": "Encryption settings incompatible with $1",
diff --git a/background.js b/background.js
index 8e8e2b0e..461d99e6 100644
--- a/background.js
+++ b/background.js
@@ -1351,11 +1351,12 @@ const SendLater = {
       await messenger.quitter.removeQuitGrantedObserver();
       return;
     }
-    let appName = messenger.i18n.getMessage("extensionName");
+    let appName = (await messenger.runtime.getBrowserInfo()).name;
+    let extensionName = messenger.i18n.getMessage("extensionName");
     let title =
       messenger.i18n.getMessage("scheduledMessagesWarningTitle") +
       " - " +
-      appName;
+      extensionName;
     let requestWarning = messenger.i18n.getMessage(
       "scheduledMessagesWarningQuitRequested",
       appName,